Protein Family Models

The bacterial phosphoenolpyruvate: sugar phosphotransferase system (PTS) is a multi-protein system involved in the regulation of a variety of metabolic and transcriptional processes. The sugar-specific permease of the PTS consists of three domains (IIA, IIB and IIC). The IIC domain catalyses the transfer of a phosphoryl group from IIB to the sugar substrate. [1]. 9689210. Novel phosphotransferase system genes revealed by bacterial genome analysis: the complete complement of pts genes in mycoplasma genitalium. Reizer J, Paulsen IT, Reizer A, Titgemeyer F, Saier MH Jr;. Microb Comp Genomics 1996;1:151-164. (from Pfam)

Date:

2024-10-16

Date:

2024-08-14

Date:

2024-08-14

This HMM represents the fused enzyme II B and C components of the sucrose-specific PTS sugar transporter system [1]. Sucrose is converted to sucrose-6-phosphate in the process of translocation into the cell. Some of these transporters lack their own IIA domains and instead use the glucose IIA protein (IIAglc or Crr). The exceptions to this rule are Staphylococci, Streptococci, Lactococci, Lactobacilli, etc. which contain their own A domain as a C-terminal fusion. This family is closely related to the trehalose transporting PTS IIBC enzymes and the B and C domains of each are described by subfamily-domain level TIGRFAMs models (TIGR00826 and TIGR00852, respectively).

Date:

2022-10-11

PTS beta-glucoside transporter subunit IIBCA catalyzes the phosphorylation of incoming sugar substrates concomitant with their translocation across the cell membrane

Date:

2017-03-21

These are part of the The PTS Glucose-Glucoside (Glc) SuperFamily. The Glc family includes permeases specific for glucose, N-acetylglucosamine and a large variety of a- and b-glucosides. However, not all b-glucoside PTS permeases are in this class, as the cellobiose (Cel) b-glucoside PTS permease is in the Lac family (TC #4.A.3). The IIA, IIB and IIC domains of all of the permeases listed below are demonstrably homologous. These permeases show limited sequence similarity with members of the Fru family (TC #4.A.2). Several of the PTS permeases in the Glc family lack their own IIA domains and instead use the glucose IIA protein (IIAglc or Crr). Most of these permeases have the B and C domains linked together in a single polypeptide chain, and a cysteyl residue in the IIB domain is phosphorylated by direct phosphoryl transfer from IIAglc(his~P). Those permeases which lack a IIA domain include the maltose (Mal), arbutin-salicin-cellobiose (ASC), trehalose (Tre), putative glucoside (Glv) and sucrose (Scr) permeases of E. coli . Most, but not all Scr permeases of other bacteria also lack a IIA domain. The three-dimensional structures of the IIA and IIB domains of the E. coli glucose permease have been elucidated. IIAglchas a complex b-sandwich structure while IIBglc is a split ab-sandwich with a topology unrelated to the split ab-sandwich structure of HPr.

Date:

2021-08-24